Mobile, sometimes called android/IOS, Developers use programming languages and source code to create software. Developers may work with multiple programming languages and operating systems, thus requirements vary for developers depending on the employer. Application development involves the process, life, and creation of the software aimed at helping users. Mobile Developers work closely with computer analysts and engineers in using languages such as Java, C#, dart, Swift to develop the necessary specifications for software. They may also test, debug, and improve applications for clients and often collaborate with product and design teams.